N.B. The deck builder only has partial support for brawl decks. You can only edit an existing brawl deck and you can't change the commander, just the other 59 cards in the deck. See Editing Decks.
Note
Once you have saved you deck you can get back to the deck builder to make further changes by clicking on the down arrow to the right of the Edit button and choosing Deck Builder from the menu that appears. See Editing Decks.
Useful Card Lists
You may find the following card lists useful when building a deck. All the following links will open in a new tab so you won't lose any deck changes when you click on them.
By Color and CMC
By Ability/Keyword
Afflict
Aftermath
Ascend
Crew
Deathtouch
Defender
Double Strike
Enchant
Energy
Enrage
Equip
Equipment
Eternalize
Explore
First Strike
First strike
Flash
Flying
Haste
Hexproof
Improvise
Indestructible
Lifelink
Menace
Prowess
Raid
Reach
Revolt
Trample
Transform
Vigilance
Other Card Lists
Amonkhet
Arena Only
Artifact
Black
Blue
Colorless
Common
Core Set 2019
Creature
Dinosaur
Dominaria
Enchantment
Green
Hour of Devastation
Instant
Ixalan
Kaladesh
Land
Legendary
Merfolk
Multicolor
Mythic Rare
Pirate
Planeswalker
Rare
Red
Rivals of Ixalan
Sorcery
Uncommon
Vampire
Welcome Deck 2017
White